Star Trek: Discovery

She sometimes wears a regular uniform (especially late in TNG) and I think was a Lt. Commander. Most of the Doctors have had regular ranks as well.

What about commercials for Star Trek: Beyond? Several of those have been in the air quite recently.

Paleu If you're counting Voyager or DS9, you are way younger than I am apparently.

Ben Grimm rimjobflashmob Roy Batty's Pet Dove Counselor Troi is a Lieutenant Commander until near the end of the seventh season, when she becomes a Commander (the rank she then holds in her subsequent movie and Voyager appearances.) This rarely comes up because she's normally not put in a command position - typically other bridge officers would be put in command before she would be, as in "The Arsenal of Freedom," where Geordi LaForge is put in command while still being a Lieutenant Junior Grade. Not unlike how medical officers are normally outside the chain of command (a lot of episodes of the original show have Scotty or Sulu command the Enterprise, but McCoy never does.)

There's an episode in season five, "Disaster," where she finds herself as by far the highest ranked officer on the bridge (Ensign Ro and Chief Petty Officer O'Brien being the only two others - more on O'Brien in a moment) and thus is required to take over, this being outside of her skillset - but the incident influenced her enough for her to decide to later take the idea of command more seriously, hence studying for and passing aptitudes that let her get promoted. After that point she could be put in command, but given there's only a handful of episodes after it it doesn't really come up.

The confusion about O'Brien's rank comes down to this: He was a Lieutenant during his appearances in seasons two and three of The Next Generation. At the beginning of season four they decided to retroactively make him an enlisted man (a Chief Petty Officer), because they'd also decided to make Worf's adoptive father an enlisted man so there was a brief scene where he made small talk with O'Brien on this fact, and would later show another enlisted man that season in "The Drumhead" (one whose concealed part-Romulan heritage deepens a witch hunt); but there aren't really many other notable examples.

Enlisted personnel did not go to Starfleet Academy; it's a shortcut for getting into space but it does also limit the opportunities for advancement. O'Brien discovered a natural aptitude for engineering during the Cardassian Wars, which influenced his move from being a tactical officer - as he was on the USS Rutledge - to working in transportation on the Enterprise and finally as Chief of Operations on DS9. While his seniority and experience has given him that assignment, he still prefers to not be called 'sir,' as an officer would, and is normally addressed as 'Chief' by his subordinates.

I didn't have to look any of that up; spending most of the year rewatching Star Trek does wonders as a refresher for this sort of thing.

Yeah, my bad, I think she was actually wearing a regular uniform in the pilot, but the shittiness of "Code of Honor" and "The One Where the Ferengi Get Introduced" must have erased that from my memory.

Well there's theoretically a whole set of enlisted ranks but yeah, they seem to show up and random and in sometimes nonsensical positions.

I thought that there would be some kind of important character in voyager that would be the rank of enlisted instead of officer due to half the crew being maquis, but nah, they are all made provisional officers. Which is supremely idiotic. If I was an enlisted serving on that ship(but really what enlisted does serve on a Starfleet ship apparently?) I would be super pissed.

"Two weeks ago, we were hunting these traitors and now I have to call this one 'sir' while I am still on maintenance duty cleaning the holodecks? No! Screw that! They can mop up after Kim and Paris, and I will be the chief Engineer!"

It is just further proof that Janeway was the worst Captain ever and that Starfleet Command is run by total morons since they promoted her to Admiral as soon as she got back.

Who else dearly wanted the last Voyager episodes to consist of Janeway's courts martial for multiple Prime Directive breaches etc?

Ensign is still an officer position though and any officer is "above" even the most senior of enlisted.

Freedom fighters!

IIRC, the Maquis on Voyager- unlike DS9 and the pre-Maquis group in TNG- were also consistently written as unequivocally wrong and staffed by the only people in the galaxy too unstable and unprofessional to even be considered as Starfleet Admirals. Also, if Voyager had taken the time to show the loss and the struggle of the Maquis from their point of view, their disagreement with Starfleet wouldn't seem so trivial even in the middle of nowhere because even though the treaty is irrelevant, all that suffering afterwards still happened and is hard to just sweep away.

By wrong I mean VOY does very little to allow the viewer to sympathize with the Maquis. Very very little is shown from their point of view, and what little time is spent in their heads is with individuals most people would not want to spend much time with. If you watched only VOY you would learn a lot about the Maquis' methods but not their reasons. As you hinted at, the central conflict between the Maquis and the Federation really isn't brought up much at all in the series. The few times with all Maquis crew on screen that I can recall all have some conflict that end in violence or explicit threats of violence in contrast to the Feds who manage to talk almost everything out, whether the arguments make sense or not.

From Post-Lupin's link:
(Though seriously, that's a good article.)

Not really explaining why the Maquis exist is probably a failure of imagination based on Voyager being a spin-off of shows that had explored the Maquis more - Berman et al. were just assuming that anyone who cared about Voyager had already been watching TNG and DS9 enough that they would just know what the Maquis' deal was.